Easons is a chain of bookshops.
they're also kobo resellers and any kobo e-reader bought from them has its own splash-screens, screensavers and power off screens with their name on it.
when one of those enters sleep mode you see 'sleeping' for maybe half a second at most before its replaced with a white screen saying 'Kobo | Eason' to represent where it was bought. The power off screen is black with a white 'Eason' on it.
changing the affiliates file from 'Eason' to 'Kobo' got rid of those splash screens but also stopped the screensaver from appearing at all somehow. The built in book cover screensaver still worked fine once it was reactivated.
I turned on debugging mode again but I was still getting exactly the same signatures with the same offset, I tried a few other offsets and signatures but still no luck.
changing the affiliates file back had the screensavers working perfectly again but it seems it will occasionally show the screensaver, Easons screensaver and then either a different screensaver image or the Easons one again as it sleeps or turns off.
I tried having the scan line read the Easons screensavers but in those cases it never even started to activate so I have to assume it shows up to late to output the image after it reads it or that it cant scan for some reason.